Topic on Project:Support desk

User's mistake, wrong version of ParserFunctions extension.

Done. Migration failed for 9 row(s).

Very cool error message. Everything is absolutely clear at the first glance.

scnr

[error] [ba7e546ea33fc2ecb983341e] /wiki/Hauptseite   PHP Unknown error: Cannot access non-public property Parser::$mOutp

ut

#0 [internal function]: MWExceptionHandler::handleError()

#1 /var/www/test/mediawiki/includes/debug/DeprecationHelper.php(202): trigger_error()

#2 /var/www/test/mediawiki/extensions/ParserFunctions/includes/ParserFunctions.php(388): Parser->__get()

#3 /var/www/test/mediawiki/extensions/ParserFunctions/includes/ParserFunctions.php(414): MediaWiki\Extensions\ParserFunct

ions\ParserFunctions::ifexistInternal()

#4 /var/www/test/mediawiki/includes/parser/Parser.php(3437): MediaWiki\Extensions\ParserFunctions\ParserFunctions::ifexis

t()

#5 /var/www/test/mediawiki/includes/parser/Parser.php(3122): Parser->callParserFunction()

#6 /var/www/test/mediawiki/includes/parser/PPFrame_Hash.php(275): Parser->braceSubstitution()

#7 /var/www/test/mediawiki/includes/parser/Parser.php(3313): PPFrame_Hash->expand()

#8 /var/www/test/mediawiki/includes/parser/PPFrame_Hash.php(275): Parser->braceSubstitution()

#9 /var/www/test/mediawiki/includes/parser/Parser.php(3030): PPFrame_Hash->expand()

#10 /var/www/test/mediawiki/includes/parser/PPFrame_Hash.php(275): Parser->braceSubstitution()

#11 /var/www/test/mediawiki/includes/parser/Parser.php(3313): PPFrame_Hash->expand()

#12 /var/www/test/mediawiki/includes/parser/PPFrame_Hash.php(275): Parser->braceSubstitution()

#13 /var/www/test/mediawiki/includes/parser/PPTemplateFrame_Hash.php(97): PPFrame_Hash->expand()

#14 /var/www/test/mediawiki/includes/parser/Parser.php(3310): PPTemplateFrame_Hash->cachedExpand()

#15 /var/www/test/mediawiki/includes/parser/PPFrame_Hash.php(275): Parser->braceSubstitution()

#16 /var/www/test/mediawiki/includes/parser/PPTemplateFrame_Hash.php(97): PPFrame_Hash->expand()

#17 /var/www/test/mediawiki/includes/parser/Parser.php(3310): PPTemplateFrame_Hash->cachedExpand()

#18 /var/www/test/mediawiki/includes/parser/PPFrame_Hash.php(275): Parser->braceSubstitution()

#19 /var/www/test/mediawiki/includes/parser/Parser.php(2951): PPFrame_Hash->expand()

#20 /var/www/test/mediawiki/includes/parser/Parser.php(1609): Parser->replaceVariables()

#21 /var/www/test/mediawiki/includes/parser/Parser.php(723): Parser->internalParse()

#22 /var/www/test/mediawiki/includes/content/WikitextContentHandler.php(301): Parser->parse()

#23 /var/www/test/mediawiki/includes/content/ContentHandler.php(1721): WikitextContentHandler->fillParserOutput()

#24 /var/www/test/mediawiki/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput()

#25 /var/www/test/mediawiki/includes/Revision/RenderedRevision.php(266): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput()

#26 /var/www/test/mediawiki/includes/Revision/RenderedRevision.php(237): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached()

#27 /var/www/test/mediawiki/includes/Revision/RevisionRenderer.php(221): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()

#28 /var/www/test/mediawiki/includes/Revision/RevisionRenderer.php(158): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()

#29 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()

#30 /var/www/test/mediawiki/includes/Revision/RenderedRevision.php(199): call_user_func()

#31 /var/www/test/mediawiki/includes/poolcounter/PoolWorkArticleView.php(91): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()

#32 /var/www/test/mediawiki/includes/poolcounter/PoolWorkArticleViewCurrent.php(97): PoolWorkArticleView->renderRevision()

#33 /var/www/test/mediawiki/includes/poolcounter/PoolCounterWork.php(162): PoolWorkArticleViewCurrent->doWork()

#34 /var/www/test/mediawiki/includes/page/ParserOutputAccess.php(299): PoolCounterWork->execute()

#35 /var/www/test/mediawiki/includes/page/Article.php(714): MediaWiki\Page\ParserOutputAccess->getParserOutput()

#36 /var/www/test/mediawiki/includes/page/Article.php(528): Article->generateContentOutput()

#37 /var/www/test/mediawiki/includes/actions/ViewAction.php(78): Article->view()

#38 /var/www/test/mediawiki/includes/MediaWiki.php(542): ViewAction->show()

#39 /var/www/test/mediawiki/includes/MediaWiki.php(322): MediaWiki->performAction()

#40 /var/www/test/mediawiki/includes/MediaWiki.php(904): MediaWiki->performRequest()

#41 /var/www/test/mediawiki/includes/MediaWiki.php(562): MediaWiki->main()

#42 /var/www/test/mediawiki/index.php(50): MediaWiki->run()

#43 /var/www/test/mediawiki/index.php(46): wfIndexMain()

#44 {main}

[exception] [ba7e546ea33fc2ecb983341e] /wiki/Hauptseite   PHP Fatal Error from line 202 of /var/www/test/mediawiki/includes/debug/DeprecationHelper.php: Cannot access non-public property Parser::$mOutput

#0 [internal function]: MWExceptionHandler::handleFatalError()

#1 {main}

[session] Saving all sessions on shutdown

Nice backtrace but it does not show what's the problem. How can i find out which component is wrong?

Do you have the correct version of Extension:ParserFunctions for your version of MediaWiki.

Huh ...! No it's been the wrong version. Sorry for that. I thought ParserFunctions is part of the Mediawiki installation bundle.

Solved, thank you very much!

It normally is, but there are different bundles you can get some of which don't include extensions.